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## Congruences, Divisibility Test

Use an appropriate function using Mathcad to find the remainder when

12345678981129 is divided by 5518.

Can anybody help in this?

1 ACCEPTED SOLUTION

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## Re: Congruences, Divisibility Test

 Kok Kiang Lian wrote: Use an appropriate function using Mathcad to find the remainder when 12345678981129 is divided by 5518. Can anybody help in this? Beginner in Mathcad...

7 REPLIES 7
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## Re: Congruences, Divisibility Test

Look up the "floor" function.

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## Re: Congruences, Divisibility Test

Or the "mod" function.

Alan

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## Re: Congruences, Divisibility Test

 Kok Kiang Lian wrote: Use an appropriate function using Mathcad to find the remainder when 12345678981129 is divided by 5518. Can anybody help in this? Beginner in Mathcad...

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## Re: Congruences, Divisibility Test

And here endeth the beginners lesson in Mathcad

Interesting observation about the built-in mod function though

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## Re: Congruences, Divisibility Test

Thxs, Sir...

As for trunc and floor, I don't really understand. It don't seems to give the right answer to the question by using trunc and floor.

I will practice on it and figure it out...

Regards

## Re: Congruences, Divisibility Test

Sir,

It seems like = sign is not showing the right answer for some other questions.... Symbolic processing is more appropriate.

Thxs again.

Regards

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## Re: Congruences, Divisibility Test

 Kok Kiang Lian wrote: Sir, It seems like = sign is not showing the right answer for some other questions.... Symbolic processing is more appropriate.

Yes.  For large integers (more 15 digits), the numeric processor will have limitations on how many digits it can store and, consequently, on how accurate the divisions will be, even with smaller integers as the divisions may not have sufficient (binary) digits to be exact.  The symbolic processor should be able to handle reasonably large numbers ...

Stuart

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